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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da62224abe6ca3339835753c65f821cc88e0c68b7932213092a748ee8a551f3b' 
  AND token = 'g56u8+WaTrimM9h84LlAG5DB9Hb+l1AsXasM5b0AJzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}